JPH0178331U - - Google Patents
Info
- Publication number
- JPH0178331U JPH0178331U JP1987175224U JP17522487U JPH0178331U JP H0178331 U JPH0178331 U JP H0178331U JP 1987175224 U JP1987175224 U JP 1987175224U JP 17522487 U JP17522487 U JP 17522487U JP H0178331 U JPH0178331 U JP H0178331U
- Authority
- JP
- Japan
- Prior art keywords
- output
- light
- rotating
- reflecting plate
- outputting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001678 irradiating effect Effects 0.000 claims 2
- 238000007493 shaping process Methods 0.000 claims 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Description
第１図はこの考案の一実施例を示す電気回路図
、第２図はこの考案の反射板の一例を示す正面図
、第３図は第１図の動作を説明するタイムチヤー
ト、第４図は従来例の第２図対応図、第５図は従
来例の第３図対応図である。
１……リール駆動機構、２，３……リール台、
４……ゴムベルト、５……反射板、５ａ〜５ｃ…
…反射領域、６……発光ダイオード、８……電源
、９……ホト・トランジスタ、７，１０……抵抗
、１１……シユミツト・トリガ回路、１３……パ
ルスカウンタ。
Fig. 1 is an electric circuit diagram showing an embodiment of this invention, Fig. 2 is a front view showing an example of a reflector of this invention, Fig. 3 is a time chart explaining the operation of Fig. 1, and Fig. 4. is a diagram corresponding to FIG. 2 of the conventional example, and FIG. 5 is a diagram corresponding to FIG. 3 of the conventional example. 1... Reel drive mechanism, 2, 3... Reel stand,
4...Rubber belt, 5...Reflector, 5a to 5c...
...Reflection area, 6...Light emitting diode, 8...Power supply, 9...Phototransistor, 7,10...Resistor, 11...Schmitt trigger circuit, 13...Pulse counter.
Claims (1)
に同期して回転し３段階以上に異なる反射率を有
する領域に分割された反射板と、反射板に光を照
射する照射手段と、反射板からの反射光を受光し
てその受光量に対応する信号を出力する受光手段
と、受光手段の出力が第１設定値以上になると出
力し、第２設定値以下になると出力を停止する波
形成形手段と、波形成形手段の出力を計数する計
数手段とを備え、中間段階の反射率を有する前記
領域からの反射光を受光した前記受光手段は、第
１と第２設定値との間の値を出力することを特徴
とするテープレコーダのテープ回転検出装置。 A rotating means for rotating the tape, a reflecting plate that rotates in synchronization with the rotating means and is divided into areas having three or more different reflectances, an irradiating means for irradiating light onto the reflecting plate, and a reflecting plate that rotates in synchronization with the rotating means, a light receiving means for receiving reflected light and outputting a signal corresponding to the amount of received light; and a waveform shaping means for outputting an output when the output of the light receiving means exceeds a first set value and stops outputting when the output falls below a second set value. , a counting means for counting the output of the waveform shaping means, and the light receiving means receives the reflected light from the region having an intermediate reflectance and outputs a value between the first and second set values. A tape rotation detection device for a tape recorder, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175224U JPH0178331U (en) | 1987-11-16 | 1987-11-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175224U JPH0178331U (en) | 1987-11-16 | 1987-11-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0178331U true JPH0178331U (en) | 1989-05-26 |
Family
ID=31467030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987175224U Pending JPH0178331U (en) | 1987-11-16 | 1987-11-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0178331U (en) |
-
1987
- 1987-11-16 JP JP1987175224U patent/JPH0178331U/ja active Pending